Using Thickness Gauge - Epson Stylus PHOTO 890 Service Manual

EPSON Stylus Photo 890/1280/1290

5.2.1.2 Using Thickness Gauge

Using the PG adjustment tool is the best way to adjust the PG (Platen Gap) as accurate
as possible. You may substitute a thickness gauge (1.14mm) for the PG adjustment
tool, however, the accuracy of PG may decline comparing to using the PG adjustment
tool.
1. Follow Step 1 to 3 in 5.2.1.1"Using PG Adjustment Tool" on page -121.
2. Bring the Carriage to the center of the printer mechanism. Then place the thickness
gauges (1.14 mm) on the front paper guide aligning them with the right and left
square cutouts in the front paper guide. (See Figure 5-3.)
Left Edge
Front Paper Guide
Carriage Unit
Cutout
Gauge Aligning Position
PF Roller
Front Paper Guide
Figure 5-3. Placing the Thickness Gauge
ADJUSTMENT
Right Edge
(Home Position Side)
Cutout
Thickness
Gauge
• Set the gauge on the horizontal top of
the ribs.
• Bring the rib tops to the middle of
the gauge.
n
To move the carriage unit, pull the timing belt with your hand.
C H E C K
n
P O I N T
Be careful not to damage the CR scale (linear encoder).
3. Move the Carriage Unit over the gauge on the right.
4. If the printhead does not touch the gauge, turn the bushing to the rear to make the
printhead touch the gauge and then, from the touching position, bring the bushing
back by one notch. On the other hand, if the printhead already touches the gauge,
turn the bushing to the front to make the printhead touch the gauge, and then push
the bushing back by one notch.
5. Move the PG lever to the rear (+).
6. Move the carriage unit over the thickness gauge on the left.
7. Bring the PG lever to the font (0).
8. Make the adjustment as in the same manner as in step 4.
9. Bring the PG lever to the rear (+).
10. Move the carriage back over the thickness gauge on the right.
11. Move the PG lever back to the front (0).
12. Make the adjustment again on the right parallelism adjustment bushing. If the
result is good, the adjustment is completed.
13. Fasten the bushing screws on both sides.
n
Platen Gap becomes wider when moving the Parallel Adjustment
C H E C K
P O I N T Bushing forward and becomes narrower when moving
backward.
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Make a PG adjustment at least 3 times, both sides and repeat one
side.
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Make sure a peak portion of the frame engages with a valley
portion of Parallel Adjustment Busing.
Adjustment
Revision C
124